Slurry and like mill.



E. J. CLARKE.

SLURBY AND LIKE MILL.

APPLICATION FILED MAR. 23, 1907.

902,557. Patented Nov. 3, 1908.

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UNITED STATES PATENT CFFICE.

ERNEST JOHN CLARKE, OF GREENI-IITHE, ENGLAND, ASSIGNOR TO GEORGE VINCENT MAXTED, FRANK KNOTT, AND WALTER JAMES COLES, OF HULL, ENGLAND.

. SLURRY AND LIKE MILL.

Application filed March 23, 1907.

To all whom it may concern:

Be it known that I, ERNEST J OHN CLARKE, subject of the King of Great Britain, residing at Greenhithe, Kent, England, have invented certain new and useful Improvements in Slurry and Like Mills, of which the following is a specification.

This invention relates to improvements in l slurry and like mills.

My said improvements are chiefly intended to be applied to mills for grinding chalk and clay in the manufacture of cement, but are also applicable to mills employed for grindl ing liquid paints, water paints, black lead and the like. When employing mills of the kind referred to, and comprising upper and lower stones or rollers, it is found that a proportion of the materials treated is not ground 3 sufliciently small and, consequently, a fin ished product is obtained containing a quantity of deleterious matter, that is to say, particles which have not been sufficiently reduced or comminuted.

My invention comprises improved means for grinding liquid, semiliquid, or Wet materials so that the same when dried are in a finely powdered state and are entirely free from lumps, hard particles, and the like.

To this end my improved mill comprises a brush of stiff wires working over a stone or other suitable bed which is surrounded by a wall or casing in Which a number of outlet apertures are formed and these apertures are fitted with filter cloths or sieves. The feed hopper through which material to be treated is fed to the mill, is provided with a perforated plate or strainer to prevent large or lumpy particles of the material treated or extraneous matter from entering the mill, any such large or lumpy particles which escape into the mill through the said. strainer being ejected through a door or sluice in the said wall or casing partly by the action of the brushes and partly by the flow of treated material through the said door or sluice.

My said invention also comprises other detail improvements hereinafter described and more particularly pointed out in the appended claims.

My improvements in mills are hereinafter described with reference to their application to a slurry mill but it is obvious that mills embodying my improvements may also be 1 Specification of Letters Patent.

Patented Nov. 3, 1908.

Serial No. 364;,200.

employed for grinding other materials as above mentioned.

In the accompanying drawing I have shown, in central vertical section, a slurry mill embodying my improvements.

Referring to this drawing: a is a bed or stone the position of which may be adjusted by means of screw-threaded bearing standards b. A driving shaft 0 has keyed thereto a hopper d which is fitted interiorly with a perforated plate or strainer c and is provided exteriorly with lugs or an annular flange f carrying screw-threaded rods 9 supporting brushes h the lower ends of which are held. above and away from the bed o these rods permitting adjustment, as may be required, of the brushes. These brushes rotate with the driving shaft 0. A scraper c' arranged within the hopper (Z is connected to a fixed cross bar k by slotted arms m to permit vertical adjustment of the scraper.

The bed a is surrounded by a wall or casing a in which a number of outlet apertures 0 are formed, these apertures being fitted with frames 79 supporting filter cloths or sieves g. At the foot of this casing a circular trough r is formed which trough is dividedby partitions 8, of which only one is shown in the drawing, into two compartments one of which is opposite a door or sluice t opening through the wall or casing n.

In the operation of my improved mill, the material to be treated is fed to the mill through the hopper (Z in which large and hard particles such as flints are retained on the perforated plate 6 from which they can be removed by hand or in any convenient manner. Soft particles of clay or chalk which when introduced into the hopper are too large to pass through the perforated plates are acted upon by the scraper i which also keeps the perforations in the platec from becoming clogged. The material to be treated, after passing through the plate 6, is acted upon by the brushes h which thoroughly and completely crush and disintegrate the small particles of chalk and clay left in the slurry. The slurry which has arrived at a sufficiently comminuted state passes through the cloths or sieves 9 into the trough r from which it is removed for further treatment, such as is necessary in the manufacture of cement therefrom. Small flints bed a and are ejected partly by centrifugal or other hard particles which have escaped through the strainer e and resist the reducing action of the brushes, being heavier than the slurry, remain on or near the surface of the force and partly by the "flow of slurry through the door or sluice t. The particles thus ejected are returned together with the slurry escaping with them through the said sluice, to a wash mill before being again fed to the slurry mill.

What I claim is 1. In a mill, the combination of a bed, a surrounding casing, brushes Working over said bed, means for effecting movement of the brushes relatively to the bed, filter cloths supported in apertures in said casing, a sluice in said casing, and a partitioned trough at the foot of said casing.

2. In a mill, the combination with the bed, of a surrounding casing, brushes working over said bed, a part comprising a rotary hopper projecting into the casing, means for adjustably securing the brushes to the hop per, filter cloths supported in apertures in said casing, a sluice in the casing, and a partitioned trough at the foot of the casing.

In a mill, the combination with the bed, of a surrounding casing, brushes over said bed, filter cloths supported in apertures in the casing, a sluice in said. casing, a partitioned trough at the foot of the latter, a rotary hopper projecting into the casing, means for adjustably securing the brushes to 1 part comprising a rotary hopper projectinginto the casing, and lugs projecting from the hopper, screw threaded rods penetrating the lugs and vertically adjustable therein and secured with their lower ends to the said brushes.

5. In a mill, the combination of a bed, a

rotatable shaft, a hopper mounted on said shaft, a perforated straining plate attached interiorly of the said hopper, an exterior flange on said hopper, screw threaded supporting rods extending from said flange, brushes supported over said bed by said supporting rods, a casing surrrcunding said bed and brushes, filter cloths supported in apertures in said casing, a sluice in said casing and a partitioned trough arranged at the foot of said casing.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesscs.

ERNEST JOHN CLARKE.

Witnesses:

ERNST LAPPERT, H. D. JAMEsoN. 

